CN108855065A - It is a kind of by Pd/ZnAl2O4The method that catalyst is used for methanol steam reforming hydrogen manufacturing - Google Patents
It is a kind of by Pd/ZnAl2O4The method that catalyst is used for methanol steam reforming hydrogen manufacturing Download PDFInfo
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Abstract
The invention discloses a kind of by Pd/ZnAl2O4The method that catalyst is used for methanol steam reforming hydrogen manufacturing, belongs to hydrogen from methyl alcohol field.This approach includes the following steps：The precursor salt containing precious metals pd is added into nitric acid solution first, the nitric acid solution containing precious metals pd is made, then by ZnAl2O4Carrier is added in the nitric acid solution containing precious metals pd, and Pd/ZnAl is made2O4Catalyst, catalyst components mass percentage are respectively：Zn：31%~36%；Al：25~30%；O：30%~35%；Pd：0.1~5.0%；Then by Pd/ZnAl2O4Catalyst is used for methanol steam reforming hydrogen manufacturing.The result shows that：Using the PdZn/ZnAl of Pd content lower (0.5wt%)2O4Catalyst can be realized preparing hydrogen by reforming methanol, and the selectivity of by-product CO and other Pd contents it is high (>5%) PdZn base catalyst is consistent, can greatly save economic cost, great economic benefit in this way.In addition, hydrogen production process of the invention also have many advantages, such as it is easy to operate, it can be achieved that portable hydrogen.
Description
Technical field
The invention belongs to hydrogen from methyl alcohol fields, and in particular to a kind of by Pd/ZnAl2O4Catalyst is used for methanol steam reforming
The method of hydrogen manufacturing.
Background technique
The a large amount of of fossil fuel consume and for the status that protective awareness of the people in recent years to environment gradually increases, seek
It is a kind of cleaning and high-energy density alternative energy source problem increasingly by the extensive concern of researchers.Hydrogen is a kind of high
Combustion value fuel, Energy Intensity are up to 127kJ/g, cannot be only used for fuel cell field power generation and use (J.Chen, J.Sun
and Y.Wang.Catalysts for Steam Reforming of Bio-oil:A
Review.Ind.Eng.Chem.Res., the important reactant of one kind 2017,56,4627-4637), is alternatively arranged as chemistry
The hydrogenation process of product and fuel.However, due to being restricted by reaction condition (temperature and pressure) and industrial cost, it is big at present
The method of Hydrogen Production In Mass Scale is still chemical method hydrogen manufacturing.In chemical method hydrogen manufacturing, traditional methane steam reforming technology, temperature height (700
~900 DEG C), pressure is high, conversion process it is complicated (Sun Jie, Sun Chunwen, Li Jigang, wait methane-steam reforming study into
Open up China engineering science, 2013,15 (2), 98-106) and preparing hydrogen by reforming methanol technology, can under low temperature and condition of normal pressure into
Row, reactant methanol are easily stored as chemical products base stock, are transported, and annual output is more than 65,000,000 tons, and with higher
H/C ratio, high conversion efficiency, so that preparing hydrogen by reforming methanol technology is with a wide range of applications.
There are two main classes for methanol steam reforming producing hydrogen, catalyzing system at present：Modified Cu base catalyst and noble metal base (such as Pd
And Pt) catalyst.The methanol steam reforming catalyst industrially largely used is the Cu/ZnO/Al produced with coprecipitation2O3It urges
Agent, copper content is up to 50% or so, but the excessively high sintering of catalyst that will lead to of reaction temperature inactivates, and copper-based catalysts are deposited
The coking and easy spontaneous combustion in air the problems such as.Such as Zr, Cr metal can be added on the basis of modified Cu base catalyst
Enhance its anti-caking power, but the selectivity of product is affected to some extent that (Yan Yuejun, Liu Qibin, Sui Jun wait methanol-water to steam
Gas catalytically reforming hydrogen producing Research progress [J] chemical industry progress, 2012,31 (7), 1468-1476).
Noble metal-based catalysts have the characteristics that high temperature resistant, not oxidizable and stability are good compared to Cu base catalyst,
Pd is supported on ZnO, Ga by Takezawa researcher discovery2O3And In2O3Have very well in methanol steam reforming reaction on carrier
Activity, wherein Pd/ZnO catalyst shows excellent CO2And H2The selectivity of product, the generation of verified PdZn alloy phase
It is high reason (N.Iwasa, S.Masuda, N.Ogawa, N.Takezawa.Steam the reforming of of activity
methanol over Pd/ZnO:Effect of the formation of PdZn alloys upon the
reaction.Applied Catalysis A General.,1995,125(1),145-157).There are many phases for PdZn alloy
State, in addition to PdZn ratio is 1:Outside 1 β-PdZn phase, there are also the molar content of Zn be 0.18 α-PdZn phase (R.S.Johnson,
A.Delariva,V.Ashbacher,B.Halevi,C.J.Villanueva,G.K.Smith,S.Lin,A.K.Datye,
H.Guo.The CO oxidation mechanism and reactivity on PdZn alloys.Physical
Chemistry Chemical Physics Pccp., 2013,15,7768-7776), G.Xia researcher has found in Al2O3On
Pd-ZnO catalyst is loaded, as Pd content increases, preparing hydrogen by reforming methanol reactivity is dramatically increased, with PdZn alloy phase
State is related, optimal Pd load quality content be 8.9%, PdZn molar ratio be 0.38 (G.Xia, J.D.Holladay,
R.A.Dagle,E.O.Jones,Y.Wang.Development of Highly Active Pd-ZnO/Al2O3Catalysts
for Microscale Fuel Processor Applications.Chem.Eng.Technol.,2010,28,515-
519)。
Summary of the invention
Place in view of the deficiency of the prior art, it is an object of that present invention to provide a kind of by Pd/ZnAl2O4Catalysis
The method that agent is used for methanol steam reforming hydrogen manufacturing.
In order to achieve the above objectives, solution of the invention is：
It is a kind of by Pd/ZnAl2O4The method that catalyst is used for methanol steam reforming hydrogen manufacturing, it is characterised in that including walking as follows
Suddenly：
1) by ZnAl2O4Carrier is added in the precursor solution containing precious metals pd, and gained mixture is heated under stiring
Solvent is evaporated, and can be prepared by Pd/ZnAl by roasting after obtained solid drying2O4Catalyst, the Pd/ZnAl2O4Catalyst
The mass fraction of each component is as follows：Zn：31%~36%；Al：25~30%；O：30%~35%；Pd：0.1~5.0%；
2)Pd/ZnAl2O4Catalyst is before using through H2Pre-reduction treatment；
3)Pd/ZnAl2O4The condition that catalyst uses is：Reactant is the liquid charging stock being made of water and methanol, reaction temperature
Degree is 150~300 DEG C, and mass space velocity is 2~10h-1, 0.1~1.5MPa of reaction pressure.
Preferably, the Pd/ZnAl2O4The mass fraction of Pd is preferably 0.1~0.5% in catalyst.
Preferably, the maturing temperature is 400 DEG C, and calcining time is 2~4h.
Preferably, the H2The temperature of pre-reduction treatment is 350 DEG C, time 1h.
Preferably, the Pd/ZnAl2O4PdZn alloy exists in catalyst with β phase.
Preferably, the precursor solution containing precious metals pd is nitric acid solution.
Preferably, the molar ratio of water and methanol is 1.1 in the liquid charging stock of the water and methanol composition:1.
Design principle of the invention is as follows：
Precursor solution containing precious metals pd is loaded to PdZn/ is prepared on gahnite first by the present invention
ZnAl2O4Catalyst, prepared catalyst need before for the reaction of catalysis methanol steam reformation hydrogen production by H2Reduction.It is right
PdZn/ZnAl2O4Catalyst carries out XRD and TPR table sign, the results showed that its active constituent PdZn alloy exists with β phase；It is catalyzed first
The experimental studies results of alcohol steam reformation hydrogen production show in PdZn/ZnAl2O4Pd content is lower in catalyst, and selectivity of product is just
It is higher, when Pd content is down to 0.5wt%
When, product CO2And H2Selective highest.
Preparation method of the invention has the advantages that：
1) PdZn/ZnAl of Pd content lower (0.5wt%) is used2O4Preparing hydrogen by reforming methanol can be realized in catalyst, and has
The selectivity of toxic byproduct CO and other Pd contents it is high (>5%) PdZn base catalyst is consistent even more excellent, in this way can be very big
Save the economic cost of hydrogen manufacturing.
2) hydrogen production process of the invention is simple, it can be achieved that portable hydrogen.
Detailed description of the invention
Fig. 1 is the XRD spectra of catalyst.
Fig. 2 is different Pd contents (2.0wt% and 15.0wt%) Pd/ZnAl2O4The TEM of catalyst schemes.
Wherein：a：Pd content is the Pd/ZnAl of 2.0wt%2O4Catalyst；B and c：Pd content is 15
The Pd/ZnAl of wt%2O4Catalyst；
Specific embodiment
Further below in conjunction with the accompanying drawings and embodiments with the present invention will be described in detail.It will similarly be understood that following embodiment is only used
In invention is further explained, it should not be understood as limiting the scope of the invention, it is specific quality in example, anti-
Between seasonable and temperature, technological parameter etc. are also only an examples in OK range, and those skilled in the art is according to the present invention
Some nonessential modifications and adaptations for making of above content all belong to the scope of protection of the present invention.Tool is not specified in embodiment
Body technique or condition person, be according to the literature in the art described technology or conditions or according to product description into
Row.Reagents or instruments used without specified manufacturer is the conventional products that can be bought by market.
The XRD characterization of catalyst is on the Ultima-IV polycrystal X ray powder diffractometer of Rigaku Rigaku company
It carries out, with Cu K ɑ (λ=0.15406nm) for radiation source, test condition is tube voltage 40KV, tube current 30mA, scanning angle
10-90 °, 10 °/min of scanning speed.Fig. 1 is a series of Pd/ZnAl of Pd load capacity2O4The XRD spectra of catalyst can be seen
Out, with the increase of Pd load capacity, PdZn alloy is gradually converted into α phase by β phase.
The TEM characterization of catalyst is carried out on TECNAI F30 Flied emission transmission electron microscope, and acceleration voltage 200KV is put
Big multiple 49000X-1000000X.Take a small amount of sample dispersion in dehydrated alcohol before test, then ultrasonic 30min drips solution
It is rear spare in drying on copper mesh.The 2%Pd/ZnAl of reduction-state2O4And 15%Pd/ZnAl2O4TEM result such as Fig. 2 a~2c institute
Show.
Embodiment 1
The Pd/ZnAl that Pd mass fraction is 0.1%2O4The specific method is as follows for the hydrogen manufacturing of catalyst methanol steam reforming：
1) Pd (NO of 1.25mL is taken3)2·2H2O solution (2mg/mL) is in beaker, then by 1g ZnAl2O4Carrier is added
In the solution, it is stirred at room temperature in the water-bath for be transferred to after 10h 80 DEG C and continues to stir, solvent is evaporated, obtained drying sample is put
Be placed in it is dried overnight in 120 DEG C of baking oven, finally at 400 DEG C roast 2h be obtain Pd mass fraction be 0.1% Pd/
ZnAl2O4Catalyst.
2) pretreatment condition before catalyst use is：Reducing atmosphere is H2, reduction temperature is 350 DEG C, and the recovery time is
1h
3) evaluation condition of catalyst is as follows：Reaction pressure is 0.1MPa, and reaction temperature is 150 DEG C, is pressed by water and methanol
Molar ratio is 1.1:The mass space velocity of the liquid charging stock of 1 composition is 10h-1, reaction result is shown in Table 1：Methanol conversion is 62.2%,
And by-product CO selectivity is then 3.3%.
Embodiment 2
The Pd/ZnAl that Pd mass fraction is 0.5%2O4Catalyst methanol steam reforming hydrogen manufacturing specific method such as
Under：
1) Pd (NO of 6.25mL is taken3)2·2H2O solution (2mg/mL) is in beaker, then by 1g ZnAl2O4Carrier is added
In the solution, it is stirred at room temperature in the water-bath for be transferred to after 10h 80 DEG C and continues to stir, solvent is evaporated, obtained drying sample is put
Be placed in it is dried overnight in 120 DEG C of baking oven, finally at 400 DEG C roast 3h be obtain Pd mass fraction be 0.5% Pd/
ZnAl2O4Catalyst.
2) pretreatment condition before catalyst use is：Reducing atmosphere is H2, reduction temperature is 350 DEG C, and the recovery time is
1h
3) evaluation condition of catalyst is as follows：Reaction pressure is 0.5MPa, and reaction temperature is 250 DEG C, is pressed by water and methanol
Molar ratio is 1.1:The mass space velocity of the liquid charging stock of 1 composition is 5h-1, reaction result is shown in Table 1：Methanol conversion is 100.0%,
And by-product CO selectivity is then 2.8%.
Embodiment 3
The Pd/ZnAl that Pd mass fraction is 1.0%2O4Catalyst methanol steam reforming hydrogen manufacturing specific method such as
Under：
1) Pd (NO of 12.5mL is taken3)2·2H2O solution (2mg/mL) is in beaker, then by 1gZnAl2O4Carrier is added
In the solution, it is stirred at room temperature in the water-bath for be transferred to after 10h 80 DEG C and continues to stir, solvent is evaporated, obtained drying sample is put
Be placed in it is dried overnight in 120 DEG C of baking oven, finally at 400 DEG C roast 4h be obtain Pd mass fraction be 1.0% Pd/
ZnAl2O4Catalyst.
2) pretreatment condition before catalyst use is：Reducing atmosphere is H2, reduction temperature is 350 DEG C, and the recovery time is
1h
3) evaluation condition of catalyst is as follows：Reaction pressure is 1.0MPa, and reaction temperature is 300 DEG C, is pressed by water and methanol
Molar ratio is 1.1:The mass space velocity of the liquid charging stock of 1 composition is 2h-1, reaction result is shown in Table 1：Methanol conversion is 95.9%,
And by-product CO selectivity is then 4.8%.
Embodiment 4
The Pd/ZnAl that Pd mass fraction is 2.5%2O4Catalyst methanol steam reforming hydrogen manufacturing specific method such as
Under：
1) with take the Pd (NO of 31.25mL3)2·2H2O solution (2mg/mL) is in beaker, then by 1gZnAl2O4Carrier adds
Enter in the solution, is stirred at room temperature in the water-bath for be transferred to after 10h 80 DEG C and continues to stir, solvent is evaporated, obtained drying sample
Be placed in it is dried overnight in 120 DEG C of baking oven, finally at 400 DEG C roast 3h be obtain Pd mass fraction be 2.5% Pd/
ZnAl2O4Catalyst.
2) pretreatment condition before catalyst use is：Reducing atmosphere is H2, reduction temperature is 350 DEG C, and the recovery time is
1h。
3) evaluation condition of catalyst is as follows：Reaction pressure is 1.5MPa, and reaction temperature is 300 DEG C, is pressed by water and methanol
Molar ratio is 1.1:The mass space velocity of the liquid charging stock of 1 composition is 10h-1, reaction result is shown in Table 1：Methanol conversion is
100.0%, and by-product CO selectivity is then 5.6%.
Embodiment 5
The Pd/ZnAl that Pd mass fraction is 5.0%2O4Catalyst methanol steam reforming hydrogen manufacturing specific method such as
Under：
1) Pd (NO of 62.5mL is taken3)2·2H2O solution (2mg/mL) is in beaker, then by 1gZnAl2O4Carrier is added
In the solution, it is stirred at room temperature in the water-bath for be transferred to after 10h 80 DEG C and continues to stir, solvent is evaporated, obtained drying sample is put
Be placed in it is dried overnight in 110 DEG C of baking oven, finally at 400 DEG C roast 3h be obtain Pd mass fraction be 5.0% Pd/
ZnAl2O4Catalyst.
2) pretreatment condition before catalyst use is：Reducing atmosphere is H2, reduction temperature is 350 DEG C, and the recovery time is
1h。
3) evaluation condition of catalyst is as follows：Reaction pressure is 1.5MPa, and reaction temperature is 300 DEG C, is pressed by water and methanol
Molar ratio is 1.1:The mass space velocity of the liquid charging stock of 1 composition is 10h-1, reaction result is shown in Table 1：Methanol conversion is 91.5%,
And by-product CO selectivity is then 16.1%.
Embodiment 6
The Pd/ZnAl that Pd mass fraction is 7.5%2O4Catalyst methanol steam reforming hydrogen manufacturing specific method such as
Under：
1) Pd (NO of 93.75mL is taken3)2·2H2O solution (2mg/mL) is in beaker, then by 1gZnAl2O4Carrier is added
In the solution, it is stirred at room temperature in the water-bath for be transferred to after 10h 80 DEG C and continues to stir, solvent is evaporated, obtained drying sample is put
Be placed in it is dried overnight in 120 DEG C of baking oven, finally at 400 DEG C roast 3h be obtain Pd mass fraction be 7.5% Pd/
ZnAl2O4Catalyst.
2) pretreatment condition before catalyst use is：Reducing atmosphere is H2, reduction temperature is 350 DEG C, and the recovery time is
1h。
3) evaluation condition of catalyst is as follows：Reaction pressure is 1.5MPa, and reaction temperature is 300 DEG C, is pressed by water and methanol
Molar ratio is 1.1:The mass space velocity of the liquid charging stock of 1 composition is 10h-1, reaction result is shown in Table 1：Methanol conversion is 95.3%,
And by-product CO selectivity is then 34.8%.
Embodiment 7
The Pd/ZnAl that Pd mass fraction is 15.0%2O4Catalyst methanol steam reforming hydrogen manufacturing specific method such as
Under：
1) Pd (NO of 187.5mL is taken3)2·2H2O solution (2mg/mL) is in beaker, then by 1gZnAl2O4Carrier is added
In the solution, it is stirred at room temperature in the water-bath for be transferred to after 10h 80 DEG C and continues to stir, solvent is evaporated, obtained drying sample is put
Be placed in it is dried overnight in 120 DEG C of baking oven, finally at 400 DEG C roast 3h be obtain Pd mass fraction be 15.0% Pd/
ZnAl2O4Catalyst.
2) pretreatment condition before catalyst use is：Reducing atmosphere is H2, reduction temperature is 350 DEG C, and the recovery time is
1h。
3) evaluation condition of catalyst is as follows：Reaction pressure is 1.5MPa, and reaction temperature is 300 DEG C, is pressed by water and methanol
Molar ratio is 1.1:The mass space velocity of the liquid charging stock of 1 composition is 10h-1, reaction result is shown in Table 1：Methanol conversion is 69.5%,
And by-product CO selectivity is then 92.0%.
Comparative example 1
The specific method is as follows for the catalyst methanol steam reforming hydrogen manufacturing for the Pd/ZnO that Pd mass fraction is 0.5%：
1) 0.0105g Pd (CH is weighed3COO)2Solid is dissolved in a certain amount of acetone soln, then uses equivalent impregnation method
Above-mentioned solution is instilled in 1g ZnO carrier, sample is dried to 8h at 80 DEG C and is evaporated solvent, finally roasts 3h at 350 DEG C
Obtain the catalyst for the Pd/ZnO that Pd mass fraction is 0.5%.
2) identical as the step 2) in embodiment 2.
3) evaluating catalyst condition is identical as the step 3) in embodiment 2.Reaction result is shown in Table 1：Methanol conversion is
97.4%, and by-product CO selectivity is then 40.1%.Compared to the Pd/ that the Pd mass fraction in embodiment 2 is 0.5%
ZnAl2O4,The Pd mass fraction of the two is identical, but by-product CO production quantity is then much higher in comparative example, corresponding hydrogen and CO2's
Selectivity reduces.
1. Examples 1 to 6 Activity evaluation of table
Reaction condition：Catalytic amount：300mg, carrier gas N2：30ml/min.
Claims (7)
1. a kind of by Pd/ZnAl2O4The method that catalyst is used for methanol steam reforming hydrogen manufacturing, it is characterised in that include the following steps：
1) by ZnAl2O4Carrier is added in the precursor solution containing precious metals pd, and gained mixture is heated to solvent under stiring
It is evaporated, can be prepared by Pd/ZnAl by roasting after obtained solid drying2O4Catalyst, the Pd/ZnAl2O4Catalyst each group
The mass fraction divided is as follows：Zn：31%~36%；Al：25~30%；O：30%~35%；Pd：0.1~5.0%；
2)Pd/ZnAl2O4Catalyst is before using through H2Pre-reduction treatment；
3)Pd/ZnAl2O4The condition that catalyst uses is：Reactant is the liquid charging stock being made of water and methanol, and reaction temperature is
150~300 DEG C, mass space velocity is 2~10h-1, 0.1~1.5MPa of reaction pressure.
2. according to claim 1 by Pd/ZnAl2O4The method that catalyst is used for methanol steam reforming hydrogen manufacturing, feature exist
In the Pd/ZnAl2O4The mass fraction of Pd is preferably 0.1~0.5% in catalyst.
3. according to claim 1 by Pd/ZnAl2O4The method that catalyst is used for methanol steam reforming hydrogen manufacturing, feature exist
It is 400 DEG C in the maturing temperature, calcining time is 2~4h.
4. according to claim 1 by Pd/ZnAl2O4The method that catalyst is used for methanol steam reforming hydrogen manufacturing, feature exist
In the H2The temperature of pre-reduction treatment is 350 DEG C, time 1h.
5. according to claim 1 by Pd/ZnAl2O4The method that catalyst is used for methanol steam reforming hydrogen manufacturing, feature exist
In the Pd/ZnAl2O4PdZn alloy exists in catalyst with β phase.
6. according to claim 1 by Pd/ZnAl2O4The method that catalyst is used for methanol steam reforming hydrogen manufacturing, feature exist
In the precursor solution containing precious metals pd be nitric acid solution.
7. according to claim 1 by Pd/ZnAl2O4The method that catalyst is used for methanol steam reforming hydrogen manufacturing, feature exist
The molar ratio of water and methanol is 1.1 in the liquid charging stock that the water and methanol form:1.
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| CN114260016A (en) * | 2021-08-11 | 2022-04-01 | 厦门大学 | Pd/ZnFexAl2-xO4Method for preparing hydrogen by reforming methanol by using catalyst |
| CN113976126A (en) * | 2021-10-28 | 2022-01-28 | 厦门大学 | Catalyst for preparing methanol by carbon dioxide hydrogenation, preparation method and application |
| CN114405496A (en) * | 2022-01-10 | 2022-04-29 | 四川亚联高科技股份有限公司 | Methanol reforming hydrogen production catalyst, and preparation method, evaluation method and application thereof |
| CN115414931A (en) * | 2022-08-31 | 2022-12-02 | 北京工业大学 | Preparation method of Pd/ZnO catalyst for hydrogen production by methanol steam reforming |
| CN115414931B (en) * | 2022-08-31 | 2024-01-05 | 北京工业大学 | Preparation method of Pd/ZnO catalyst for preparing hydrogen by methanol steam reforming |
| CN115518654A (en) * | 2022-09-30 | 2022-12-27 | 四川蜀泰化工科技有限公司 | High-efficiency, high-selectivity and high-stability catalyst for hydrogen production by methanol reforming and preparation process thereof |
| CN115518654B (en) * | 2022-09-30 | 2023-07-25 | 四川蜀泰化工科技有限公司 | Catalyst for preparing hydrogen by reforming methanol and preparation process thereof |
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